초록 ▼

Briefly, the invention contemplates a method for monitoring and evaluating the performance of machines such as electro mechanically or pneumatically driven valves. Further, the method includes evaluation of motor driven pumps. The constant power factor is obtained from signals representative of the

Briefly, the invention contemplates a method for monitoring and evaluating the performance of machines such as electro mechanically or pneumatically driven valves. Further, the method includes evaluation of motor driven pumps. The constant power factor is obtained from signals representative of the voltage supply the current supplied to the valve driver. This is representative of the power consumed. Also, the mechanical noise level during the single stroke valve actuation or start-up cycle pump actuation is monitored simultaneously with electrical current flow and also fluid flow noise downstream of the device before and after the valve is seated. The temperature of the electric motor driver is also measured synchronously with the current measurements to monitor for any appropriate change in power factor. A change in the power factor is indicated by changes in the temperature of the motor winding and the change of the winding resistances. The power, temperature and noise are reported collectively and individually by a series of plots or displays showing the parameters measured or computer against a synchronized time line. The trend of any changes in the parameters is shown.

대표청구항 ▼

A method for analyzing changes in the performance of a valve operated in a single stroke by a driver comprising the steps of: obtaining a first parameter indicative of the electrical current delivered to the driver during the single stroke; obtaining a second parameter indicative of the temperature

A method for analyzing changes in the performance of a valve operated in a single stroke by a driver comprising the steps of: obtaining a first parameter indicative of the electrical current delivered to the driver during the single stroke; obtaining a second parameter indicative of the temperature of said driver during the single stroke; obtaining a third parameter indicative of the noise generated by said valve during said single stroke; modifying said first parameter with said second parameter in accordance with a predetermined formula to obtain a corrected power parameter; obtaining a synchronized record of said corrected power parameter and said third parameter for a predetermined period during a full stroke opening or closing action of said valve to permit qualitative assessment of said single stroke.